First Principles of Soil FertilityOrange Judd, 1908 - 265 páginas |
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Página 7
... grain per acre ; the average for the last eight years being 1134 bushels . Wheat grown in the same way for fifty years produced in the fiftieth year 934 bushels of grain per acre ; the average for the last eight years being 111⁄2 ...
... grain per acre ; the average for the last eight years being 1134 bushels . Wheat grown in the same way for fifty years produced in the fiftieth year 934 bushels of grain per acre ; the average for the last eight years being 111⁄2 ...
Página 14
... grain crops . These interesting figures are given below . LEAST AMOUNT OF WATER PER ACRE REQUIRED TO PRO- DUCE DIFFERENT YIELDS OF GRAIN Yield per acre Acre Inches of Water Required Wheat Barley Oats Corn 15 • 4.5 3.24 2.35 2.52 20 6.0 ...
... grain crops . These interesting figures are given below . LEAST AMOUNT OF WATER PER ACRE REQUIRED TO PRO- DUCE DIFFERENT YIELDS OF GRAIN Yield per acre Acre Inches of Water Required Wheat Barley Oats Corn 15 • 4.5 3.24 2.35 2.52 20 6.0 ...
Página 35
... grains , " with air spaces between , these spaces in the surface foot amounting to fully half the bulk of the soil . These grains vary in size ac- cording to the character of the soil , being very fine in clay , and comparative- ly ...
... grains , " with air spaces between , these spaces in the surface foot amounting to fully half the bulk of the soil . These grains vary in size ac- cording to the character of the soil , being very fine in clay , and comparative- ly ...
Página 36
... grain is surrounded by a film of water , and this water contains dissolved in it tiny quantities of the mineral ingredients of the soil , including nitrogen in the form of nitrates . The root hairs absorb the mois- ture as it is ...
... grain is surrounded by a film of water , and this water contains dissolved in it tiny quantities of the mineral ingredients of the soil , including nitrogen in the form of nitrates . The root hairs absorb the mois- ture as it is ...
Página 42
... grain . Oats , grain . Clover hay . Tobacco . Cabbage . Potatoes . Pounds of Nitrogen Pounds of Phosphoric Acid Pounds of Potash 17.6 5.4 8.9 14.1 5.7 4.7 12.6 5.3 9.9 20.2 8.7 5.5 16.5 6.9 4.8 21.2 5.5 18.7 24.5 6.6 40.9 2.4 1.4 5.8 ...
... grain . Oats , grain . Clover hay . Tobacco . Cabbage . Potatoes . Pounds of Nitrogen Pounds of Phosphoric Acid Pounds of Potash 17.6 5.4 8.9 14.1 5.7 4.7 12.6 5.3 9.9 20.2 8.7 5.5 16.5 6.9 4.8 21.2 5.5 18.7 24.5 6.6 40.9 2.4 1.4 5.8 ...
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Términos y frases comunes
acid and potash acre agricultural ammonia amount of nitrogen amount of plant animals applied average bacteria barn barnyard manure bedding carbonic acid clay clover commercial fertilizers complete fertilizers composition compounds condition corn crop decay deep stall denitrification drainage dry matter elements of plant Experiment Station fact farm farmer feeding fertilizing constituents fertilizing materials fertilizing value field grain green manuring ground grown hot fermentation humus important inches increase ingredients kainite land leaching legumes leguminous lime liquid excrement loss of nitrogen lysimeters manure produced materials ments method mineral matter mixed moisture necessary nitrate of soda nitrification nitrifying bacteria nitro nitrogen nure obtained organic matter oxygen phoric acid phos phosphate phosphoric acid plant food plant growth plots plowed pounds practically present rains ration removed rock roots rotation shown soil soil contains soluble substances sufficient sulphate superphosphate supply surface tillage tion urine wheat yield
Pasajes populares
Página 187 - The production possible from a definite amount of plant -food can be secured only when the conditions are such as to permit its proper solution, distribution and retention by the soil. The fact that fertilizers may now be easily secured, and the ease of application, have encouraged a careless use, rather than a thoughtful expenditure, of an equivalent amount of money or energy in the proper preparation of the soil.
Página 221 - Furthermore, the mineral elements are relatively cheap, while the nitrogen is relatively expensive, and thus that the economical use of this expensive element, nitrogen, is dependent to a large degree upon the abundance of the mineral elements In the soil. It is therefore advocated that for all crops and for all soils that are in a good state of cultivation, a reasonable excess of phosphoric acid and potash...
Página 241 - One will seek to know what the different forms of plant-food are, what they do, from what sources they can be obtained, and how he can use them to best advantage. He will become to some extent an investigator, and will, of necessity, take a deeper interest in his work.
Página 225 - When such crops as corn, cabbage, grass, potatoes, etc., have a luxuriant, healthful growth, an abundance of potash in the soil is indicated ; also, when fleshy fruits of fine flavor and texture can be successfully grown. (e). When a soil produces good, early maturing crops of grain, with plump and heavy kernels, phosphoric acid will not generally be found deficient in the soil. Such general indications may often be most helpful, and crops should be studied carefully with these facts in mind.